Dhcp Snooping; Ip Dhcp Snooping; Table 50: Dhcp Snooping Commands - Motorola EX-3524 Cli Reference Manual

Layer 2 gigabit ethernet poe/poe+ switch
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Chapter 8
| General Security Measures

DHCP Snooping

DHCP Snooping

ip dhcp snooping

DHCP snooping allows a switch to protect a network from rogue DHCP servers or
other devices which send port-related information to a DHCP server. This
information can be useful in tracking an IP address back to a physical port. This
section describes commands used to configure DHCP snooping.

Table 50: DHCP Snooping Commands

Command
ip dhcp snooping
ip dhcp snooping information
option
ip dhcp snooping information
policy
ip dhcp snooping verify
mac-address
ip dhcp snooping vlan
ip dhcp snooping trust
clear ip dhcp snooping
database flash
ip dhcp snooping database
flash
show ip dhcp snooping
show ip dhcp snooping
binding
This command enables DHCP snooping globally. Use the no form to restore the
default setting.
Syntax
[no] ip dhcp snooping
Default Setting
Disabled
Command Mode
Global Configuration
Command Usage
Network traffic may be disrupted when malicious DHCP messages are received
from an outside source. DHCP snooping is used to filter DHCP messages
received on an unsecure interface from outside the network or fire wall. When
DHCP snooping is enabled globally by this command, and enabled on a VLAN
interface by the
ip dhcp snooping vlan
Function
Enables DHCP snooping globally
Enables or disables DHCP Option 82 information relay
Sets the information option policy for DHCP client
packets that include Option 82 information
Verifies the client's hardware address stored in the DHCP
packet against the source MAC address in the Ethernet
header
Enables DHCP snooping on the specified VLAN
Configures the specified interface as trusted
Removes all dynamically learned snooping entries from
flash memory.
Writes all dynamically learned snooping entries to flash
memory
Shows the DHCP snooping configuration settings
Shows the DHCP snooping binding table entries
command, DHCP messages received on
– 242 –
Mode
GC
GC
GC
GC
GC
IC
PE
PE
PE
PE

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